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require 'memcache'
module ActiveSupport
module Cache
class MemCacheStore < Store
module Response
STORED = "STORED\r\n"
NOT_STORED = "NOT_STORED\r\n"
EXISTS = "EXISTS\r\n"
NOT_FOUND = "NOT_FOUND\r\n"
DELETED = "DELETED\r\n"
end
attr_reader :addresses
def initialize(*addresses)
addresses = addresses.flatten
addresses = ["localhost"] if addresses.empty?
@addresses = addresses
@data = MemCache.new(*addresses)
end
def read(key, options = nil)
super
@data.get(key, raw?(options))
rescue MemCache::MemCacheError => e
logger.error("MemCacheError (#{e}): #{e.message}")
nil
end
# Set key = value if key isn't already set. Pass :force => true
# to unconditionally set key = value. Returns a boolean indicating
# whether the key was set.
def write(key, value, options = {})
super
method = options[:force] ? :set : :add
response = @data.send(method, key, value, expires_in(options), raw?(options))
response == Response::STORED
rescue MemCache::MemCacheError => e
logger.error("MemCacheError (#{e}): #{e.message}")
false
end
def delete(key, options = nil)
super
response = @data.delete(key, expires_in(options))
response == Response::DELETED
rescue MemCache::MemCacheError => e
logger.error("MemCacheError (#{e}): #{e.message}")
false
end
def delete_matched(matcher, options = nil)
super
raise "Not supported by Memcache"
end
private
def expires_in(options)
(options && options[:expires_in]) || 0
end
def raw?(options)
options && options[:raw]
end
end
end
end
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